The Battle of the River Plate, 1939.
France
Tennessee
Coldharbour in the Virginia theatre, or Kennesaw in the Western theatre, if you classify that as a major victory.
Tennessee
During the American Civil War, the South gained confidence with each major victory that occurred, particularly from 1861 to 1863. Of special significance for Southern confidence was the South's victory in the first major battle of the war, the First Battle of Bull Run in July 1861.
I think First Bull Run might be classified as a major victory for the Confederates. Otherwise, we're probably talking about Lee's Seven Days Battles in Summer 1862.
The colony of South Carolina was "owned" by the British - before the Revolutionary War ended in victory for the U.S. in 1981.
If you refer to 1910 british victory against afrikaners (permanent settlers in south Africa of dutch origins), than it's south Africa.
Many historians suggest that Cold Harbor in Virginia was the last Southern victory. It was a tactical victory, but it did not stop Grant's advance; so, strategically, it was not really a victory.
state of last major Southern victory
No American victory brought down a British government.
Battles included: Bennington ~ August 16, 1777 ~ A victory for the American Colonists Brandywine ~ September 11, 1777 ~ A victory for the British Bunker Hill ~ June 17, 1775 ~ A victory for the British Camden ~ August 16, 1780 ~ A victory for the British Cowpens ~ January 17, 1781 ~ A victory for the American Colonists Freeman's Farm (First Battle) September 19, 1777 ~ A victory for the American Colonists Freeman's Farm (Second Battle) October ~ 7, 1777 ~ A victory for the British Kings Mountain ~ October 7, 1780 ~ A victory for the American Colonists Lexington and Concord April 19, 1775 ~ The Beginning of the Revolutionary War Long Island ~ August 27, 1776 ~ A victory for the British Monmouth ~ June 28, 1778 ~ The Battle Was A Tie Princeton ~ January 3, 1777 ~ A victory for the British Quebec ~ December 31, 1775 ~ A victory for the British Trenton ~ December 26, 1776 ~ A victory for the American Colonists Yorktown ~ October 6-19, 1781 ~ British Surrenders ~ War Ends